1640883 has 4 divisors (see below), whose sum is σ = 2187848. Its totient is φ = 1093920.

The previous prime is 1640879. The next prime is 1640887. The reversal of 1640883 is 3880461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1640879) and next prime (1640887).

It is not a de Polignac number, because 1640883 - 2² = 1640879 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

1640883 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640883.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273478 + ... + 273483.

It is an arithmetic number, because the mean of its divisors is an integer number (546962).

2^1640883 is an apocalyptic number.

1640883 is a deficient number, since it is larger than the sum of its proper divisors (546965).

1640883 is an equidigital number, since it uses as much as digits as its factorization.

1640883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546964.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1640883 is about 1280.9695546733. The cubic root of 1640883 is about 117.9485316095.

The spelling of 1640883 in words is "one million, six hundred forty thousand, eight hundred eighty-three".